Cbimping-machine



EFA ENT FFIQE.

UNITED STABS DAVID BISSELL, OF DETROIT, MICHIGAN.

CRIIVIPING-MACI-IINE.

Speccaten of Letters Patent No. 29,757, dated August 28, 1860.

To all whom it 'may concern:

Be it known that I, DAVID BrssELL, of Detroit, in the county of IVayne and State of Michigan, have invented a new and Improved Crimping-IIachine; and I do hereby declare that the following is a. full, clear, and exact description of the same, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is a side elevation of my improved machine for crimping the fronts of boots. Fig. 2 is an end elevation of the same. Fig. 3 is a transverse section taken through Fig. 1 in the vertical plane indicated by the red line a', cc. Fig. 4 is a view of one of the gripping dogs. Fig. 5 shows the inside of one of the clamping plates in perspective.

Similar letters of reference indicate corresponding parts in the several figures.

This invention is an improved machine for crimping or shaping the fronts of boots before they are stitched up, in which the leather while wet is stretched over a former of the proper shape, and the former is drawn down between two clamping jaws, smoothing and crimping the leather and giving to it the proper shape.

Hy invention consists in a novel manner of applying lateral pressure to the aws, and at the same time stretching the leather tightly at the instep portion as will be hereinafter described.

To enable those skilled in the art to fully understand my invention, I will proceed to describe its construction and operation.

In the drawings, A is a table on which the crimping machinery is mounted, the legs of which are to be firmly secured to the floor on which the machine rests. On the top of the table rests two clamping jaws B, B, which are attached to lugs projecting from the table top by screws a, a, and nuts b, b, by which latter the jaws B, B, may be adjusted laterally,that is, set farther apart or brought closer together. Besides these two adjusting screws there is another, lettered c, which has sliding nuts c, c', with blocks e, c, of india rubber interposed between the nuts and the jaws B, B; the hand wheel d, is used in this case to adjust the jaws laterally. The object of the rubber pieces is to admit of a slight yielding action to the jaws when uneven uppers or fronts are crimped. Should it be found necessary rubber blocks may be used for the lower adjusting screws a, a, in the same manner as for the screw c.

D is the former under which the leather fronts to be crimped are stretched while in a wet state. g, g, are gripping dogs applied to the former for stretching` the leather' and holding it on the former during the operation of crimping it,-one of these dogs is shown by Fig. 4. The former D has a handle D', applied to one end, and its other end is pivoted to the back part of the table at h, as shown in Fig. 1, and in using it after the leather is stretched over it and clamped by the dogs g, g, it is drawn down between the jaws B, B, said jaws being previously adjusted by the lateral adjusting screws before described. At this stage of the operation two supplemental jaws E, E, (shown in Figs. 3 and 5) are broughty to act upon the leather with a clamping action by means of two levers Gr, G, which are pivoted at c', c', to the aws B, B, and acted upon by a foot treadle H. The springs j, j', are used to return the parts back to their original position after the pressure on the foot lever is taken off.

The supplemental gripping jaws E, E, have lugs projecting from them which lugs pass through slots in the jaws B, B, and when the lateral pressure is put upon them these lugs are forced against the surface of the leather on the former, while the former is drawn down between the jaws B, B, and operate so as to take out the wrinkles and make the leather smooth on the former. The dogs g, g, may then be set farther back so as to keep thevleather in its stretched and smooth state, springs 7c, c, Fig. 3, are introduced between the plates E, E, and outside of the aws B, B, which force the lugs back from the leather when the levers G, G, are released.

In operating this machine the leather front is placed on the former after wetting it, and its edges are gripped between these dogs g, g, g, and drawn tight on the former. The former is now drawn down between the jaws B, B, which are adjusted as described to receive it, and while the former is being drawn down, the lugs on plates E, E, are forced against the leather in the manner dejaws ld', levers G, G, and treadle H, arranged combined and operating in the Inanner herein set forth.

DAVID BIssELL.

Witnesses:

JEROME CROUL, WM. F. BELMAN. 

